These days the emphasis in nutrition has been placed on protein and whether we are getting enough. The truth is that individuals are more likely to suffer from excess of it than the converse...
...So now I will get to the real issue, which seems to have languished somewhat since the food industry has focused on protein. This is the amount of fibre in our western diet, which is sadly lacking.

According to Maharishi AyurVeda, there are three equally important aspects to mental performance: dhi — learning and comprehension, governed by Vata dosha; dhriti — processing and retention of knowledge, the realm of Pitta dosha; and smriti— memory or recall, controlled by Kapha dosha.
For the best mental performance and realization of the fullest mental potential, each of these three factors individually needs to be at its peak, and, more important, the coordination among the three factors also needs to be optimal.